Drag saw having angularly adjustable blade



Sept. 23, 1952 w. JACOBSON DRAG sAw HAVING ANGULARLY ADJUSTABLE BLADE 2 SHEETS- -Sl-IEET 1 Filed Sept. 25, 1949 ifidizcobson INVENTOR Sept. 23, 1952 w. JACOBSON 2,611,399

DRAG SAW HAVING ANGULARLY ADJUSTABLE BLADE Filed Sept. 23, 1949 2 SHEETS SHEET 2 W 7V. Jizcabson N INVENTOR I I Q)\ BY 1 1 I a ATTORNEYS.

Patented Sept. 23, 1952 USTABLE 'William Jacobson, As'hford, Wash.

.Applicatiph September 23, 1949, Serial No..117.,2.86

1 Claim. (Cl. 143-63) This invention relates to saws designed primarily for cutting logs and other large timbers. one of the objects being to provide a motor driven saw in which the angular position of the. saw blade may be adjusted relative to the axis of reciprocation of the saw driving element.

A further object is to provide a structure of this character which is simple and compact in construction and will not readily get out of order.

A further object is to provide 'a structure of this character which iss'o formed as to carry accumulated sawdust out of the cut, on each cutward stroke of the saw blade. I

With the foregoing and other objects, in view which will appear as the description proceeds, th invention'consists of certain novel details of construction and combinationsof parts hereinafter more fully described and pointed out in the claim, it being understood that changes may be made, in the construction and; arrangement of parts without departing from the spirit of'the invention as claimed.

In the accompanying drawings, the preferred form of the invention has been shown.

Referring to the drawings Fig. 1 is a front elevation of the saw in use, portions being broken away, the angular disposition of the saw blade being somewhat exaggerated to show the operation more clearly.

Fig. 2 is a top plan view.

Fig. 3 is an enlarged section showing the shank at one end of the saw and the means for transmitting motion thereto from a driven shaft.

Fig. 4 is a section through the bearing of a shank at the other end of the saw showing the restraining spring used in connection therewith.

Fig. 5 is a detailed view of an adjustable stop used as a part of the device.

Referring to the drawings in detail, I designates a wide fiat base which can be of any suitable material and is provided, between its ends, with a motor 2. This can be an electric motor or an internal combustion motor. A housing 3 is mounted on the base near one end and has a bearing 4 in which a shank 5 is mounted for reciprocation. This shank can be angular in cross section and has one end connected by a pitman 6 to a crank I which is carried by or formed with a transverse shaft 8 journaled in the housing. A pulley 9 is secured to the shaft 8 and is driven bybelt ID or the like from a pulley H on the shaft l2 of the motor 2.

A tubular yoke I3 is connected at one end to the bearing 4 while its other end receives a stud 26 rigid with a bearing I4 in which a shank l5 is mounted to reciprocate. The stud 26 is .secured rigidly to the yoke in selected positions of telescoping adjustment, by means of a set screw 21 threaded in opening 28 of the yoke. Theshank [5 can be rectangular in cross section and is slightly out of alignment relative to theshanki. Both the shank 5 and the shank l5 are'detachably secured by bolts l! to the respective ends of a saw l8. v

A hnusing I9 is extended from the'bearing l4 .and contains acoiled spring '20 which, extends around a ortion of the shankand exerts a'con stant thrust; against. a head 2] detachably. and adjustablyconnected to one end of theshank I5. action ofthe spring serves to .hold'the saw taut-and obviously when the motor is op.- erated, the shaftv B is driven therebyand the saw caused to reciprocate. Each time the saw is pulled towardthe base i, the spring is. compressed .andafter the saw reaches, the limitv of movement toward the base, itwill be pulled back to its other extreme position by the action of the spring and also by the thrust exerted thereagainst by the pitman 6 and the crank I.

Anchoring devices, in the form of angular brackets 22 or the like, are joined to that end of the base I remote from the bearing 4 and adapted to be forced into the ground. Instead of providing these brackets, or in addition thereto, a bearing rib 23 can be formed along the bottom of the base I at said end. Furthermore, extended upwardly from said end of the base-is a combined guard and stand 24 which can be integral with or attached to the base and forms a rigid structure on which the entire mechanism can rest when the saw and base are swung upwardly to substantially vertical positions. In other words, with the structure standing on this base or guard 24, the saw can be reciprocated substantially vertically or stored conveniently.

An important feature of the invention is the fact that when the saw is used for cutting downwardly through a log L or the like, the base I will be mounted solely on one end and the weight of the base and the parts carried thereby will be such as to force the saw to feed through the log while the saw is being reciprocated. This is by reason of the fact that the brackets 22 are pivots for the base as well as anchors. One bracket can be driven into the ground deeper than the other to compensate for an incline in the ground, thus permitting anchoring of the base in positions of transversely tilted adjustment. This also permits the making of inclined saw cuts. In the latter instance, it is to be noted that all the weight of In accordance with the invention, the shanks. 1:

5 and I5 reciprocate in an out-of-line arrangement, that is, it is intended that they be out'of' longitudinal alignment with each other, and that the outer shank l5 reciprocate in a somewhat lower path than that of the inner shank 5. This What is claimed is:

In a power driven saw of the type comprising a U-shaped yoke having elongated spaced parallel legs and a bight portion carried by and extending between the legs, a bearing carried by one of the legs remote from the bight portion, a shank mounted in the bearing for reciprocation in a rectilinear path which lies parallel with the bightportion, -a;prime mover mounted adjacent the yokej means-connected to the prime mover and to the shank for reciprocating the shank in the rectilinear path, a second bearing member, a shank mounted in the second bearing member for reciprocation in a rectilinear path which lies in spaced parallel relation to the bight portion.

- and a saw blade connected to the shanks and exmisalignment of the shanks is exaggerated in the drawings, but in actuality should be very slight,-

depending mainly upon the length of the stroke. It may be from approximately onefourth to onehalfinch. I a result, the saw blade is disposed obliquely to the line of'movementof'the shanks," and'this arrangement has the efiect of causing the saw blade to rise from the cut during its outward stroke, and to drop down on its return or'cutting stroke, thus car'rying'thej accumulated sawdust outofthecut. v I

For the purpose of disposing the shanks 5 and I5 in a selected out-of-line relative arrangement, the stud 26 integral with the shank hearing has been illustrated astelescopicallyreceived in the yoke I3, in which it willbe rigidly secured in a selected position by means 'of theset screw tioning of the saw blade 18, to give the saw blade a cleaning function on one stroke and a cutting function on the other stroke.

tending between the legs remote from the bight portion, the other of said legs being provided with a socket which opens through the end thereof, a stud carried by the second mentioned bearing member and telescopically entering the socket, and means carried by said other leg andreleas- 'ably engaging the stud for holding the second REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 16,421 Winter Jan. 13, 1857 229,908 Nunan July 13, 1880 1,119,524. Morris et al. Dec; 1, 1914 1,289,604 Baker Dec. 13, 1918 1,450,540 Boner Apr. 3, 1923 2,206,614 OHern' July 2, 1940 

